Envoland waste recycling plants


Some frequently asked questions on Envoland’s waste recycling plant.

1.) What is pyrolysis factory size area requirement.

    The machinery space formula: for every 10 tons system space about 500 square meters is required.
    Storage size about same space as machinery space. Therefore, 10 tons machinery requires about 20M x 25M = 500 square meters.
    Storage space is 500 square meter, totally is 1000 square meter for 10 tons per day feedstock processing capacity.
    Machinery height is 2-4 M, if one floor then request 8 M height plant. If two floors then each floor 6 Meter height.

2.) What is the Power requirement?

    The power consumption, if utilizing the tail gas then to power consumption should be able to reduce as 125-150KW/hr for10T/hr, 225-250KW/hr for 20T/D for reference.

3.) What is the water requirement?

    10 Tons capacity pyrolysis plant water consumption: 30T (for cooling system circulation usage using about 3 month) , for neutralization about 2-5% of the daily processing capacity per day. Water Pool Size : 10T/tank x 3 pcs

4.) What is the man power requirement for 10Tons/Day input capacity pyrolysis plant ?

    Each shift requires 2-3 people, if three shifts then totally need 8-9 people.

5.) What is the cost of the chemicals?

    In Taiwan we pay the catalyst cost about  0.015-0.03 USD per litre fuel output.

6.) What is the pyrolysis plant lead time and how long does it take to install the plant?

    Lead time is about 4-6 months depend on the plant capacity size.
    Installation timing is about 2 months.

7.) What is the expect life time of the plant?

    10~15 years of normal operation

8.) What is the annual maintenance cost?

    About 2-3% of total value of equipment cost.
    Every two weeks maintenance one time one day.

9.) We are interested in the process of waste material to gasoline and diesel. Our raw materials is waste plastic , rubber (waste tires), waste oil (feed stock will be subject to the market availability). Please provide end product % against the feed stock.

    35-40% for rubber, 60-80% for waste plastic, 85-90% for waste oil , it all depends on feedstock content.

10.) What amount of diesel can be produced from a ton of waste plastic in percentage of conversion?

    First stage: 70% fuel , carbon about 15-30%, pyrolysis gas about 5%

    Second stage : 85%+/- diesel , 15% gasoline from 1st stage fuel (excluding the Char that will be utilized for Theremal Energy for Dewatering and eventually electricity for own consumptions (in a Steam turbine generator Set) .

11.) How many megawatts of electricity can be produced from a feedstock of 20 tons per day of biomass/plastic/waste oil if all the pyrolysis output product ( gas, gasoline, diesel)  is used for electricity production.

    The thermal value of gasoline & diesel > about 10900 kcal/kg or 10900kcal/litre.
    Gas about 4500kcal/kg for 20 mts capacity per day , oil output yield to 70%, about 14 mts
    oil and 1 mts gas, so the total thermal value about 14MTx1000kg/MTX10900kcal/kg+1x1000x4500
    =152600000+4500000=157100000 kcal/day

    According to energy conservative principle
    1 kw*h (1 degree electricity)= 860kcal , so 157100000kcal/day/860kcal = 182674 kw*h(degree electricity )/day-24hour , about=7611KW/hr =7.6Mw/hr

    30% energy loss (for back to pyrolysis system) so the rest has a value of about =5328 KW = 5.3Mw (we could install 5MW ( or 3M x2) generator upon 20 mts capacity).
    Evaluation above for reference!!

12.) What is the procedure for removal of waste paper coating film?

    1. Shredding
    2. Sink and rub by mixing with water
    3. Chemical agent to remove paper ink and wood tissue
    4. Waste plastic film/paper pulp layers separation
    5. Dry finally

13.) What plastic feedstock gives the best yield of oil going through your plant? I have lots of dirty film and some hard plastics?

    Mainly plastics that are used for daily consumption such as LDPE, HDPE, PP….., hard or soft it does not matter!

14. ) Does the feed stock material have to be prepared to a certain specification prior feeding into the system?

    We can design the plant to hot melt or regrind the feed stock to about one inch size particles – smaller the size obtains better efficiency.

15.) Can the same machine recycle both plastics and tyres?

    Yes, the same machine can recycle both plastics and tyres, but to recycle the tyres requires an additional shredding machine. However, the oil output from tyres has a higher sulfur percentage, therefore, we suggest process separately.

16.) What type of raw materials can be processed to obtain oil from your plastic pyrolysis plant?

    All the waste plastic can be processed to obtain oil - PP, PE, PS and everyday consumer type plastics would convert into 60-80% oil. Some engineered plastics such as PBT, PC and POM contain less oil and would not suggest these for pyrolysis process.

17.) What kind of plastics can be processed in the Envoland plant?

    Our equipment can process all kinds of plastics such as PVC and PET without any problem. With PVC one has to remove the chloride, this is removed during the hot melt and cracking procedure without any problem.

    PET has a lower oil content and a polyester molecule structure so we do not recommend PET.

    Polypropylene is a good quality plastic and one can obtain a very high percentage of oil. However, plastics like polyethylene the oil content is lower - PP about 70% output and PE about 75%

18.) What main material is used in the manufacturing of the plant?

    All reactors, tanks and tubes are stainless steel except platforms, brackets, electrical parts, cooling towers, air and water anti-pollution parts.

    Material specifications:
    Reactors: 310S, 316/304, Electrical: explosion-proof level.  For temperatures higher than 200 C we use 316L, others are 304.
    The quality and tank thickness: 310S/316/304, thickness: 0.9-1.2 mm depending on the temperature and pressure.
    Our focus is on safety so everything we manufacture is to a very high international standards.

19.) What are the outputs from the plastic pyrolysis process other than oil?

    Gas and carbon powder residue.

20.) Is the oil quality equivalent to LDO or Diesel?


21.) What  chemicals are used to catalyse?

    The catalyst is composed of mineral material - not chemicals. It can be recycled and the last option is it can be mixed with bitumen or coal.

22.) Is the reactor horizontal or vertical?

    Vertical reactor for liquid waste, horizontal reactor for solid waste.

    If you have a query that is not answered here please contact us.

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